20513898 has 40 divisors (see below), whose sum is σ = 46347840. Its totient is φ = 6781320.

The previous prime is 20513897. The next prime is 20513903. The reversal of 20513898 is 89831502.

It is a super-2 number, since 2×20513898² = 841640022308808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20513891) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22063 + ... + 22973.

It is an arithmetic number, because the mean of its divisors is an integer number (1158696).

Almost surely, 2^20513898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20513898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23173920).

20513898 is an abundant number, since it is smaller than the sum of its proper divisors (25833942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20513898 is a wasteful number, since it uses less digits than its factorization.

20513898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 20513898 is about 4529.2270863802. The cubic root of 20513898 is about 273.7470181698.

The spelling of 20513898 in words is "twenty million, five hundred thirteen thousand, eight hundred ninety-eight".